I think I have a partial answer here:
- The 4-ScrollLock part has no other effect that having the related visual/auditive feedback to blink/ring twice...
- the standard-keyboard-you-left-plugged-in-just-in-case can do that
. - As for the 0,4 sequence for Next Screen and 0,1 for Previous Screen, it has to trigger some window manager of some sort that is expected to do the job

To compensate for the lack of feedback,
the FirstCap utility has been recommended by
Conceptor in
this post from the former Fingerworks support forum.
...I found another
FirstCap download URL. I don't know this tool, I will give it a try right now.
...
Well, I did try it, so I know that I can live without it!